Satellite image of Semeru volcano on 5 Sep 2025
Ibu Volcano Volcanic Ash Advisory: VA TO FL070 LAST REP AT 05/1217Z EST VA DTG: 05/1340Z to 7000 ft (2100 m)
Turrialba Volcano (Costa Rica) activity update Sep 4, 2025 – Unrest
The Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA) reported that unrest continued at Turrialba between 3 September 2025 (local) and 4 September 2025 (local). The alert level at Turrialba remained at „Level 2 – Warning“ (on a 0–4 level scale).
Source: Observatorio Vulcanológico y Sismológico de Costa Rica – Universidad Nacional (OVSICORI-UNA)
Current Alerts:
Observatory alert level: „Level 2 – Warning“ (on a 0–4 level scale)
Aviation Alert Level: unavailable or not collected
Adapted from: Smithsonian / USGS Daily Volcanic Activity Report for Sep 4, 2025
Tengger Caldera Volcano (Indonesia) activity update Sep 4, 2025 – Unrest
The Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG) reported that unrest continued at Tengger Caldera on 4 September 2025 (local). The alert level at Tengger Caldera remained at „Level 2 – Alert“ (on a 4-level scale). Plumes rose to a maximum of 600 meters (1,969 feet) above the vent.
Source: Center for Volcanology and Geological Hazard/Pusat Vulkanologi dan Mitigasi Bencana Geologi (CVGHM/PVMBG)
Current Alerts:
Observatory alert level: „Level 2 – Alert“ (on a 4-level scale)
Aviation Alert Level: unavailable or not collected
Adapted from: Smithsonian / USGS Daily Volcanic Activity Report for Sep 4, 2025
